get_real_ip.php

   <?php
   if (!empty($_SERVER["HTTP_CLIENT_IP"]))
   {
    //check for ip from share internet
    $ip = $_SERVER["HTTP_CLIENT_IP"];
   }
   elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
   {
    // Check for the Proxy User
    $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
   }
   else
   {
    $ip = $_SERVER["REMOTE_ADDR"];
   }

   // This will print user's real IP Address
   // does't matter if user using proxy or not.
   echo $ip;

   ?>